public static ColorF ToColorF(this System.Drawing.Color col)
{
ColorF ret = ColorF.FromRGB(
(double)col.R / 255,
(double)col.G / 255,
(double)col.B / 255
);
return(ret);
}
static void CreateLUT(string paletteName, System.Drawing.Color[] palette, string outfile, ILCCColorSpace cs, int levels, bool useChroma, bool neutral)
{
Log.WriteLine("Creating LUT...");
Log.WriteLine(" Palette: {0} ({1} colors)", paletteName, palette.Length);
Log.WriteLine(" Colorspace: {0}", cs.ToString());
Log.WriteLine(" Output file: {0}", outfile);
Log.WriteLine(" {0}", useChroma ? "COLOR" : "GREY");
int imageWidth = levels * levels;
int imageHeight = levels;
Log.WriteLine(" Image size: {0} x {1}", imageWidth, imageHeight);
Directory.CreateDirectory(Path.GetDirectoryName(outfile));
var bmp = new Bitmap(imageWidth, imageHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
BitmapData destFontData = bmp.LockBits(new Rectangle(0, 0, imageWidth, imageHeight), ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
int chromaComponents = useChroma ? 2 : 0;
for (double ir = 0; ir < levels; ++ir)
{
for (double ig = 0; ig < levels; ++ig)
{
for (double ib = 0; ib < levels; ++ib)
{
// Y coord = green (top = 0, bottom = 1)
// X coord = red (left = 0; right = 1)
// X cell = blue (left = 0; right = 1)
ColorF srcColor = ColorF.FromRGB(ir / levels, ig / levels, ib / levels);
//srcColor = ColorF.FromRGB(.5,.3,.2);
int y = levels - (int)ig - 1;
int x = (int)ib * levels;
x += (int)ir;
if (neutral)
{
destFontData.SetPixel(x, y, srcColor);
}
else
{
// find the nearest color in the palette.
// a value set normally consists of multiple luma & chroma components for a char (for example 5 luma + 2 chroma)
// for this we just have the normal default. all our colorspaces are LCC (luma chroma chroma).
ValueSet srcValueSet = cs.GetValueSetForSinglePixel(srcColor, useChroma);
System.Drawing.Color closestColor = System.Drawing.Color.Black;
double closestDistance = 1e6;
foreach (var pc in palette)
{
ColorF paletteColor = pc.ToColorF();
ValueSet palValueSet = cs.GetValueSetForSinglePixel(paletteColor, useChroma);
double dist = cs.ColorDistance(srcValueSet, palValueSet, 1 /*luma L*/, chromaComponents);
if (dist < closestDistance)
{
closestDistance = dist;
closestColor = pc;
}
}
//closestColor = srcColor;
destFontData.SetPixel(x, y, closestColor);
//destFontData.SetPixel(x, y, srcColor);
}
}
}
}
bmp.UnlockBits(destFontData);
bmp.Save(outfile);
bmp.Dispose();
bmp = null;
}